Device for trimming and shaping washing machine tubs or the like



Aug. 19, 1958 Filed Dec. 4, 1953 QJNQ Z6 illllllllllllllllllli R. A. CHRISTY ETAL DEVICE FOR TRIMMING AND SHAPING WASHING MACHINE TUBS OR THE LIKE 4 Sheets-Sheet 1 R. A. CHRISTY ETAL DEVICE FOR TRIMMING AND SHAPING WASHING 'Aug. 19, 1958 MACHINE TUBS OR THE LIKE 4 Sheets-Sheet 2 Filed Dec. 4, 1953 John, 11 Moore fnz/erz bru" .Foberi Q. C/zrz'sy and nninnnn 1953 R. A. CHRISTY ETAL 2,848,033

DEVICE FOR TRIMMING AND SHAPING WASHING MACHINE TUBS OR THE LIKE 4 SheetsSheet 3 Filed Dec. 4, 1953 A m. M 4 a a M f xvfi fnuenjorzs'" fioer'i a. 67271 and John 1?. Moore ifimflm 1958 R. A. CHRISTY ET AL 2,848,033

DEVICE FOR TRIMMING AND SHAPING WASHING MACHINE TUBS OR THE LIKE Filed 1380- 9 4 Sheets-Sheet 4 United States PatentO DEVICE FOR TRHVHVIING AND -SHAPING WASH- ING MACHINE TUBS OR THE LIKE Application-December 4, 1953; Serial No. 396,222

11 Claims. (Cl. 153-=-2) The present invention relates in general to washing machine tubs and more particularly to machines fortorming-or shaping washing machine tubs.

The principal object of the present invention is to provide a machine for trimming the edge of an opening in the: top ofi a washing machine tub and then curling the trimmed edge in order to provide a smooth periphery around theopening.

A further object of the'present invention is to provide a machine for trimming-and curling the periphery of the top opening'in a washing machine tub, said machine comprising a rotatable mandrel having trimming rollers cooperative therewith to provide for trimming the periphery of the opening and'a curling roller "cooperative'with the mandrel for curlingthe edgearound the opening in order to provide a smooth peripherytherearound.

A further object of the present invention is to provide provide a washing machine 'tub forming machine having an expansible mandrel capable of being expanded by fluid pressure'into engagement with the'inner periphery of an opening-in a washing machine tub'and reciprocable trimming and curling rollers, each of which is actuated by fluid pressure.

A further'object of the presentinvention is to provide a fluid pressure controlsystem for actuating the fluid pressure motors which move said trimming and curling rollers and actuate said mandrel in order to expand the same. I

A further object of the present invention is to provide an electrical control circuit in association with-the'fluid pressure system for providing saidv sequential operation of the mandrel, trimming-and curling rollers and for further enabling manualselection ofthetrimming and curling rollers.

The above enumerated objects of thepresent invention and numerous other objects and numerous, advantages thereof will become apparent from the following detailed description when read in conjunction with the accompanying drawings wherein:

Fig. 1 is-a top plan view showing the general-arrangement of structural parts comprising the subject matter of the present invention;

Fig. 2 is a sectional View taken substantially-along'flie 1ine'2-2 in Fig. l and showing in detail the mandrel and trimming rollers and control cylinders;

Fig. 3 is a partial front elevation view taken'substantially. along the line 3--3 of Fig. 1 and showing the curling roller and its operating motor;-

Fig. 4 is a detailed fragmentary sectional view taken substantially along the line 4-4 in Fig. 2 and showing the locking mechanism for the trimming rollers;

Fig. 5 is a sectional viewtakensubstantially along the A more detailed object of the present invention is to 35 ice line 5-5 in Fig. 2 and looking in the direction of the arrows;

Fig. 6 is a detailed view showing a portion of the rotatable mandrel; and

Fig. 7 is a schematic view showing the electrical and fluid'pressure control circuits for thema'chine comprising the subject matter of the present invention.

With reference now to the drawings wher'einlike reference numerals have been utilized in the'differentviews to identify identical parts, the present invention com prises a central base section 10 havinga pair of slides 11' and 12 for reciprocably mounting 'a pair of side support sections 13 and 14. A motor 15 and'suitable' trans mission mechanism 16 are mounted on the base section 10 and the transmission rriechanism'1'6 has an output shaft 17 having a bevel gear 18 securely fixed" thereto adapted to mesh with a bevel gear 19 fixed on a ver-' tically extending shaft 20 and adapted to drive a man'- drel 21: The central base section 10 is provided with an upstanding cylindrical portion 22 and a hollow concentric sleeve shaft 23 is rotatably mounted withinthe cylindrical portion 22 by meansofsuitable roller bearings 24and this hollowsha'ft 23 carries "the mandrel 21 at its upper end.

The cylindrical shaft 23 is formed at its'upper end" with 'a'r'adially extending flange '25 and this flange has a" concentric 'gear 26 securedthereto:' A suitable pinion" gear'27 (Fig. 3) fixedo'nshaft 20 is providedfofdriv ing the gear 26 andmandrel 21; H

The mandrel 21 also" includes 'a disc-like"rneniber" 28 formed with a pluralityof'T-shaped radially exter'idiiig' slots 29. Suitable T-shaped members 30 are're'ciprocably mounted within the "slots 29. v

Ea'ch of the T-shap'ed members 30"is 'pr'ovidedwi'th a pin 31*which extends through a radially -elcnigated'slot' 32 for'rned in the flange" and a compression" spring disposed in a=suitable opening 33, fOrrnedinf'said'flangeZS and in abutment with a set screw 34 is effective 'to nor; mally hold said-T shape'd' members" in their radially? inward position: Each ofthe T-sh'aped members '30 is provided with a flat tub positioning member35suitab1y' secure'd"thereto and this member 35 isproi'lidedwitlia' peripheral grove 365 The peripheral groove'36in'eaehof the-members 35 carried by theT-shaped members 30 is effective, upon peripheral expansion of'all of tlie'mem ber's 35 to recei've the'ne'ck-"por'tion 37 of a washingmachine' tnb ss th'erein seas to rotatably'r'n'ou'nt the'wash ing machine tub 38 on the mandrel 21.

The-mandrel 21;u en' the peripheral expansion "of all" of'the members 35is'efiec'tive' to shape the nec'k"po r'tion' of tubs-38in theevent 'th'at they are not round. Aswill be"app arent-, in the event thafthe-neck 'portiori of"-the tubs 38'are not round, the 'mandr'el, upon eir'panding; forces the necks of the tubs 38 into afroundshape."

The mandrel 21 in'cludes a 'frustO cOnicaI section 39" whichis reciprocabli "mounted with"'res'pect to the shaft 23' wherebythe sides of "the frusto conicalsection39act on the inner ends of the 'T shaped member's '30in order to urge the members 30 radially outwardly upon move-1 ment of'the frusto-conical *sectio'ri' '39 'in a jdownw-ard direction. -The frusto-conicalsectioii39 is fiiie'dlysecured" to a cylindrical member 40 disposed withiii the cylindrical shaft 23 and adapted to reciprocate thereini' A iston v rod 41 havinga pistorr'42' secured'theretoand disposed within-a positioning'cyliride'r' 43 'ispro'videdfor recip rocatingth'e frusto-conical section 39 :in order to expand or contract the mandrel head 21. Fluid under pressure is admitted into the positioning cylind'er either" above or below the-piston- 42in order toeffeb't therecipr'trcato ry movement of the rod 41 and mandrel liead'21'. *The'ro'd 41 is rotatably mounted within the frusto-coiiical section" 39 by'mean's" of a plurality brim-11st bearintsmfi As was stated heretofore, the side support section 13 is reciprocably mounted by means of a slide 11 and suitable adjusting bolt means 45 are provided for maintaining the side support section in any desired vertical po-' sition.

The side support section 13 is provided with a horizontally extending top portion 46 formed with a pair of tracks 47 and 48 for receiving a slide 49 therebetween. Suitable means are provided for rotatably mounting a first trim roller or disc 50 on the slide 49 and the slide 49 is reciprocable horizontally to bring the rounded edge 51 of the disc 50 into engagement with the outer periphery of the neck portion 37 of the tub 38. The rounded portion 51 of the disc 50 cooperates with the grooves 36 formed in the outer peripheries of the T-shaped sections 30 in order to properly shape the periphery of the neck 37 preparatory to the trimming operation.

A fluid pressure actuating motor 52 comprising a cylinder 53 and a piston 54 is provided for moving the disc 50 into its operative position. A cylinder 53 is fixed to the horizontal portion 46 of the side support section 13 by means of suitable lugs and a pivot bolt 55 and the piston 54 is fixed to the slide 49 by means of a suitable piston rod 56. The horizontal position of the disc 50 when moved to its actuated position may be adjustably controlled by means of a suitable adjusting bolt 57. The adjusting bolt 57 has one end axially fixed for rotation in an opening formed in a depending lug 58 extending downwardly from the horizontal portion 46 of the side support section 13 and the bolt 57 is threaded into a depending lug 59 formed on the lugs 60 to which the cylinder 53 is pivotally secured by means of the bolt 55. It is therefore apparent that by adjusting the bolt 57, the horizontal position of the cylinder 53 and of the disc 50 may be adjusted.

A cutting or trimming disc 61 is rotatably mounted on a vertically reciprocable member 62. The member 62 is reciprocable vertically in a suitable slide 63 secured to the horizontal portion 46 of the side support section 13. The reciprocable member 62 is provided with a cut-out portion 64 in its central region and a pin 65 secured to the slide 63 extends into the cut-out portion 64. A suitable compression spring 66 is disposed between the pin 65 and one end of the opening for constantly urging the member 62 and trim roller 61 in a downward direction. A suitable enclosure plate 67 is mounted on the face of the opening 64 for holding the compression spring 66 within the opening.

At the lower end of the member 62 a roller 68 is provided which is adapted to cooperate with an eccentric 69 fixed to lever 70, with both the eccentric and lever being pivotal about a pin 71. The pin 71 is secured to the side support section 13 so that upon rotation of the eccentric 69, the reciprocable member 62 is moved upwardly and downwardly due to the cooperation between the eccentric 69 and the roller 68 rotatably mounted on the lower end of the member 62. The lever 70 is secured at its opposite end, by means of a pivotal connection 72, to a piston rod 73 formed with piston 74 thereon and reciprocable within a cylinder 75 which is pivotally secured to a depending lug 76 extending downwardly from the horizontal section 46 of the side support section 13. Upon the admission of fluid under pressure into the cylinder 75 either above or below the piston 74, the lever 70 is pivoted about pivot shaft 71 and in turn, the reciprocable member 62 carrying the cutting disc 61 is raised or lowered. The compression spring 66 serves, under all conditions, to bias the member 62 downwardly so as to maintain the roller 68 in constant engagement with the eccentric 69.

A pair of lock pin cylinders 77 and 78 are provided for holding the first trim disc 50 in operated position after it has been moved into such position by means of the motor 52. Each of the lock pin cylinders 77 and 78 are respectively secured to the portion 46 of the side support section 13 by means of suitable support plates 79 secured to both the cylinders and the section 46. Disposed within each of the cylinders 77 and 78 is a reciprocable piston 80 having a piston rod 81 comprising the lock pins. Suitable compression springs 82 are provided for urging the pistons 80 outwardly in opposition to the fluid pressure operating behind the piston 80. The end of each of the lock pins 81 is adapted to enter an opening 83 formed in the slide 49, which opening is so disposed as to be opposite the lock pins 81 when the disc 50 has reached its operated position with its edge 51 in cooperative relation with the mandrel 21.

The side support section 14 is vertically reciprocable in a suitable vertically extending track formed on the central base section and is adapted to be held in adjusted position by means of an adjusting bolt 84 threaded through a lug 85 formed on the side of the central base section 10. The side support section 14 is provided with a horizontal top plate 86 and horizontally recipr cable with respect to the top plate 86 is a curling disc base plate 87 adapted to rotatably mount a curling roller 88. An actuating motor 89 comprising a cylinder 90 having a piston 91 reciprocable therein is secured to the horizontal plate 86 by means of a suitable bolt 92 pivotally mounted in lugs 93 secured to the section 86. The piston 91 is fixed to the slidable plate 87 by means of a piston rod 94 and when fluid under pressure is admitted behind the piston 91 in the cylinder 90, the plate 87 and curling disc 88 are moved to the left (see Fig. 3) to bring a grooved periphery 95 of the curling disc 88 into operative position relative to the mandrel head 21. The groove 95 in the periphery of the curling disc 88 cooperates with the trimmed edge of the end opening in the washing machine tub 38 and functions to curl this edge around into abutment with the outer surface of the neck of the tub so as to provide a smooth periphery around the opening in the washing machine tub that will be in no way present any sharp edges such as would cut a person who is utilizing the washing machine tub.

Suitable means are provided for adjusting the position to which the operating motor 89 moves the curling disc 88. Such means comprise an adjusting bolt 96 rotatably mounted within an opening in a depending lug 97 formed on the member 86 and threaded into a suitable opening 98 formed in a depending lug 99 fixed to the horizontal portion of the side support section 14.

The fluid pressure and electrical control circuits for controlling the operation of the washing machine tub manufacturing apparatus will now be described. A source of fluid pressure, which may comprise either air pressure or some liquid such as oil may be provided by means of a suitable pump P and is constantly supplied to a plurality of main control valves comprising a first trim cylinder control valve 100, a second trim cylinder control valve 101, a position cylinder control valve 102 and a curl cylinder control valve 103. Fluid under pressure which may include 'air under pressure is supplied to these valves by the pump P through conduits 104, 105, 106 and 107 respectively. The valves 103 are respectively provided with control solenoids 108, 109, 110 and 111. Each of the valves 100103 is provided with a suitable bleed port 112.

Under normal conditions, with the solenoid 108 deenergized, the valve 100 operates to admit fluid under pressure from the line 104 through the valve 100, through a line 113 to the right end of cylinder 53. This causes the piston 54 to move to the left so as to move the first trim disc 50 out of engagement with the mandrel 21. At the same time, fluid from the left end of the piston 54 in the cylinder 53 is bled through a conduit 114 and through control valve 100 to bleed port 112.

When the solenoid 109 is energized, fluid under pressure is supplied from the pump or source P through the conduit to the valve 101 and from this valve through a line 115 to the upper end of the cylinder 75 so as to move the piston 74 downwardly. Fluid from beneath the piston 74 is bled through the line 116 and through control valve 101 and bleed port 112. This causes the piston rod 73 to be moved downwardly so as to raise the cutting disc 61. At the same time the fluid under pressure is supplied to the upper end of the cylinders 75, the fluid is also supplied to the lock pin cylinders 77 and 78 for actuating the lock pins 81 for holding the first trim disc 50 in operated position.

When the solenoid 109 is deenergized, the fluid from the source P passes through the line 105 and valve 101 and through line 116 to raise the piston 74. Fluid from above the piston 74 and from the lock pin cylinders 77 and 78 is bled through :line 115, control valve 101 and bleedport 112.

When the solenoid 110 is energized, fluid from source P is supplied through line 106 to valve 102 and proceeds from; the valve102 through a line 117 to the upper end of cylinder 43 so. as to move the piston 42 downwardly and-thereby. causev thefrusto-conical section 39 to expand the mandrel 21: into engagement with the inner periphery of the opening in the washing machine tub 38. At this same time fluid from beneath the cylinder 42 is bled through aline 118 and through control valve 102 and bleed port 112.

Whenthesolenoid 111 is energized, fluid from the pump P issupplied throughlthe line 107 to the control valve 103 and proceeds from the control valve 103 through a line 119 into the right end of the curl cylinder 90, and thereby efiects'movement of the piston 91 to the left so as to bring the curl disc 88 into operative engagement with the mandrel 21. Fluid from the left end of the cylinder- 90 is bled through line 120 and through control valve 103 out through the bleed port 112.

The electrical control circuit for the solenoids'108-111 comprises a timing, device121, a sequence switch 122, a stop switch 123 and a start switch 124. The timing device 121 'includesa timer motor 125 which is effective to operate a plurality of timing cams (not shown) for efiecting the closure, in sequence, of switches 126, .127, 128, 129 and 130. A pair of powerr'lines 131 and 132 are provided and;upon closure of the start switch 124, a circuit is established from the line 131, through the start switch 124, through the timer motor 125' to the line 132. A-holding-coil 125:: is also energized upon closure of the start switch 124 and as soon asthe timer motor 125 commences to rotate, theswitch 126 is closed. The

closure of the switch 126 establishes a circuit from the,

line 131, through thexnormally closed stop button 123, through the closed switch 126, through the winding 125a to the line 132. As-long as'the winding 125a remains energized, the timer motor 125 continues to operate.

The manually operable sequence switch 122 enables the operator to manually determine whether the machine is to operate fully automatically or whether only the trimming rollers or only the curling rollers will operate. The sequence switch 122 comprises three switch arms 133, 1341 and 135. Each ofthe switch arms 133-135 are adapted to: be rotated in unison and may be moved from their full line positions shown, in engagement respectively with terminals 136,137 and 138, into either of their dotted line positions where the switch arms 133-135 are respectively adapted to engage either terminals 139, 140 and 141 or terminals 142, 143 and 144,

With thesequence switch"122 conditioned so that the switch arms .133-135occupy their full line positions, as shown, in engagement with terminals 136-138, closure of control switch 128. completes anenergizing circuit from line. 131 through the." switch 128, over a conductor 14S, throughthe switch arm l33 and terminal 136, over a conductor 146, through solenoid 108, over a lead 147 and over a line 148 to the line 132; Closure of the control switch 129 completes an energizing circuit, which extends from line 131',"through theswitch 129, over a lead 149 through the switch arm 134 and terminal 137, over a lead 150, through the solenoid 109, and over leads 147 and'148"to line 132; Closure of the control switch 130 completes an energizing circuit which extends from 'line 131 through the switch 130, over a lead 151, through switch arm 135, over a lead 152, through a solenoid 111 and over lead 148 to line 132. Closure of control switch 127 completes an energizing circuit from line 131 through the switch 127, over a lead 153, through the solenoid 110'and over lead 148 toline 132.

Rotationof the-sequence switch 122 so as to bring the switch arms 133-135 into respective engagement with terminals 139, 140 and 141 permits operation of only the trim rollers 50 and 61'. This is due to the fact that the terminal 141 is not connected so as to enable energizatio-n of the curl'cylindersolenoid 111. Energization of the first and' second trim cylinder solenoids 108 and 109, when the switch arms 133 and 134 are in engagement with terminals 139 and 140 respectively, is over substantially the same circuits as .was previously traced when the switch arms 133-135 were positioned in their full line position.

When the operator desires to have only the curling roller 88 operative, the'sequence switch 122 is rotated to bring the switch arms-133-135 into respective engagement with terminals 142, 143 and 144. It will be noted that terminals 143 and 144'are each disconnected from any ofthe controlsolenoids 108-111 but that terminal 142is connected to the curl'cylinder; control solenoid 111 over alead 154 which is connected to lead 152. It is therefore apparent that when the sequence switch 122 is positioned with;the-switch arms 133-135 in engagement'with terminals 142-144; onlythe curl cylinder is rendered operativeto move thecurling roller 88 into operative position.

' The timer mechanism 121 includes a plurality of manually adjustableqdevices" 1515, each of which are adjustable so-astorontrol the sequence of closure and theelectricalgcircuits are deenergized and as a result.

the frusto-conical sectiorr39 is in its raised or dotted line positionso as to' enable the mandrel 21 to occupy its contracted position'. Also, both trim rollers 50 and 61 and thecurling roller 88', are in their inoperative position. The operator then places a washing machine tub over the mandrel 21 in aposition such that upon expansion of the mandrel 21 its .outer periphery will engage the neck portion 37 of the tub 38. Assuming that the operator has previously placed the sequence switch 122 in its position" shown, with switch arms. 133-135 respectively engaged With' terminals 136 -138, the operator will then close the startbutton 124 for starting the timer motor 125. The normally closed stop button 123 is effective to establish a holding circuit for the timer motor 125 as soon as the control switch 126 has moved to its closed position. This holding circuit for the timer motor 125 remains established until the completion of the trimming'and curling cycle whereupon the switch 126 opens so asto deenergize both the coilv 133 and the motor 125.

The control switch 127 closesshortly after the closure of the switch 126 and the switch 127 remains closed for substantially the entire operating-cycle. The closure of the control switch 127., it will be recalled, completes an energizing circuit for the position cylinder solenoid winding so as to actuate the valve 102 in a manner so as to cause fluid under pressure from pump P to be supplied to line 106,'valve 102 and line 117 to the upper end of cylinder 43 so asto move the piston 42 downwardly and thereby cause the frusto-conical section 49 to etfec'texpansion of the mandrel head 21.

When the mandrel head 21 has expanded until it engages the inner periphery of the neck portion 37 of the tub 38, the timing mechanism 121 will have operated to effect closure of the control switch 128. The closure of the control switch 128 is efifective to energize the first trim cylinder solenoid 108 and this actuates control valve 100 so as to cause fluid under pressure to be supplied from the fluid pressure supply'P, over line 104, through valve 100 and through line 114 to the left end of the first trim cylinder 53 so as to move the piston 54 to the right and thereby move the first trim roller into operative engagement with the neck 37 of the tub 38.

Shortly thereafter, the timing mechanism 121 effects closure of the control switch 129 and this establishes an energizing-circuit for the second trim cylinder solenoid 109. Energization of the solenoid 109 actuates the control valve 101 so as to cause fluid under pressure to be supplied from the source P through the line 105, through valve 101 and line 115 to the upper end of the second trim cylinder so as to actuate piston 74 and cause it to move downwardly and in turn raise the second trim roller 61. The second trim roller 61 is then capable of cooperating with the first trim roller 50 to trim the periphery of the neck 37 of the tub 38.

When the motor 15 has functioned to rotate the tub 3S sufliciently to have caused the trim rollers 50 and 61 to trim approximately one-half of the periphery of the neck 37, the timing mechanism 121 functions to close the control switch 130. It will be recalled that the closure of the control switch 130 establishes an energizing circuit for the curl cylinder solenoid 111 and upon energization of this solenoid the control valve 103 moves so as to establish a fluid circuit from source P over line 107, through valve 103 and over line 119 to the right end of the curl cylinder so as to remove the piston 91 and curl roller 88 to the left into cooperative engagement with the periphery of the mandrel head 21. When the motor 15 has rotated the mandrel head 21 sufiiciently to have caused the curling roller 88 to curl the entire periphery of the opening in the tub 38, the timing mechanism 121 will function to open all of the control switches 126, 127, 128, 129 and 130. Under these circumstances all of the energizing circuits for the control solenoids 108-111 are deenergized and the associated control valves are moved to the opposite positions so that all of the control cylinder pistons may be returned to their inactive position, thereby returning the trimming and curling rollers to their open positions and raising the mandrel head frusto-conical section 39 so as to enable the operator to remove the tub 38 from the mediately breaks the holding circuit for the winding 133 and the energizing circuit for the timing motor and until the start button is again depressed the electrical circuits will remain in the condition which they were in at the time of actuation of the stop button.

It will be recalled that upon movement of the second I trim cylinder piston 74 to its actuated position, fluid under pressure is also provided for both of the lock pin cylinders so as to move the lock pins 81 into a position to hold the first trim roller 50 in operative position for so long as the second trim roller or cutting roller 61 occupies its actuated position.

Upon manual operation of the sequence switch 122 to bring the switch arms 133, 134 and 135 into respective engagement with the terminals 139, and 141, only the trim rollers 50 and 61 are operative. Under certain conditions it is presumed that the operator of the machine will desire to either only trim the neck of the opening in the washing machine tub or only curl the neck of the opening in the washing machine tub and by enabling the operator to position the sequence switch 122 in either $3 of its dotted positions, either the trimming operation or the curling operation alone may be effected.

It will be apparent to those skilled in the art that diiferent shapes may be imparted to the peripheries of the trim roller 50 and curling roller 88, as well as to the expansible block sections 35 of the mandrel head 21 so as to impart a diflerent shape to the neck 37 of the tub 38. It will further be apparent that difierent sized blocks 38 may be utilized for accommodating larger or smaller tubs 38 and likewise, the operative positions of trim roller and curling roller 88 may be adjusted by means of adjusting bolts 57 and 96 for compensating for the different sized tubs. Further, the adjusting bolts 45 and 84 enable the raising and lowering of the trimming and curling rollers so as to accommodate still further shapes of the neck portions of the tub 38.

By the present invention we have provided an improved device for trimming and shaping the opening in a sheet metal tub. It is contemplated that numerous changes and modifications may be made in the present invention without departing from the spirit or scope thereof.

What is claimed is:

1. A device for forming and shaping the periphery of a substantially round opening formed in a washing machine tub and comprising, in combination, an expansible rotatable mandrel adapted to be positioned within the opening in said tub and expanded into engagement with the periphery of said opening for effecting rotation of the tub, trimming means comprising a first rotatable disc cooperable with said mandrel for flaring the edge of said opening and a second rotatable cutting disc cooperable with said first disc for trimming the edge of said opening, a curling disc cooperable with said mandrel for curling the trimmed edge of said opening to provide a smooth periphery therearound, and actuating means for successively expanding said mandrel and actuating said trimming and curling means.

2. A device according to claim 1 wherein said actuating means includes fluid pressure actuated means for successively expanding said mandrel and actuating said trimming and curling means.

3. A device according to claim 1 wherein said actuating means includes fluid pressure actuated means for respectively actuating said mandrel and said trimming and curling means, and wherein said actuating means also includes electrical means for sequentially actuating said fluid pressure actuated means.

4. A device according to claim 1 wherein said actuating means includes fluid pressure actuated means for respectively actuating said mandrel and said trimming and curling means, and wherein said actuating means also includes electrical means for sequentially actuating said fluid pressure actuated means, said electrical means including manually controlled means for selectively rendering certain of said fluid pressure actuated means inoperative.

5. A device according to claim 1 wherein said actuating means includes a plurality of fluid pressure actuated motors for respectively actuating said mandrel and said trimming and curling means, electrical solenoids respectively corresponding to said motors for controlling the actuation of said motors, an electrical circuit for said solenoids for sequentially actuating the solenoids and thereby sequentially operating said motors, and said electrical circuit including a manually controlled sequence switch for selectively deactuating certain of said solenoids and thereby manually controlling the operation of said mandrel, trimming and curling means.

6. A device for shaping the neck surrounding an opening in a washing machine tub comprising, in combination, a rotatable mandrel adapted to mount said tub with said neck disposed around the mandrel, said mandrel being expandable into firm engagement with the inner periphery of said neck, a fluid pressure actuated wedging device for expanding said mandrel, trimming means comprising a shaping disc cooperable with the mandrel for partially shaping said neck and a cutting disc cooperable with said shaping disc for uniformly trimming said neck upon rotation of said mandrel, fluidpressure actuated motor means for moving said shaping disc into operable position for cooperating with said mandrel and for moving said cutting disc into operable position for cooperating with said shaping disc, acurling disc cooperable with said mandrel for curling the trimmed and shaped edge of said neck to provide a smooth neck around said opening, a fluid pressure actuated motor for moving said shaping disc into cooperable position with said mandrel, and means providing a source of fluid pressure for actuating each of said fluid pressure actuated devices.

7. A device according to claim 6 and including electrical control means for said fluid pressure actuated devices for rendering said devices operable sequentially.

8. A device according to claim 6 and including electrical control means for said fluid pressure actuated devices for rendering said devices operable sequentially, and a manually controlled switching device for selectively rendering certain of said fluid pressure actuated devices inoperable.

9. A device for forming and shaping the periphery of a substantially round opening formed in a Washing machine tub and comprising, in combination, an expansible rotatable mandrel adapted to be positioned Within the opening of said tub and expanded into engagement with the periphery of said opening for rounding the periphery of said opening and for effecting rotation of the tub, trimming means comprising a first rotatable disc cooperable with said mandrel for flaring the edge of said opening and a second rotatable cutting disc cooperable with said first disc for trimming the edge of said opening, a curling disc cooperable with said mandrel for curling the trimmed edge of said opening to provide a smooth periphery therearound, and actuating means for successively expanding said mandrel and actuating said trimming and curling means.

10. A device for forming and shaping the periphery of a substantially round opening formed in an end of a substantially cylindrical sheet metal object comprising, in combination, a rotatable expansible mandrel adapted to be positioned in said opening and expanded into engagement With the periphery of the opening for facilitating rotating said object, trimming means operable to trim the periphery of the opening in said object upon rotation of said mandrel, means operable upon rotation of said mandrel for curling the peripheral edge of said opening to provide a smooth periphery therearound, and actuating means for sequentially actuating said trimming means and said curling means.

11. A device for forming and shaping the periphery of a substantially round opening formed in an end of a substantially cylindrical sheet metal object comprising, in combination, a rotatable expansible mandrel adapted to be positioned in said opening and expanded into engagement with the periphery of the opening for facilitating rotating said object, trimming means operable to trim the periphery of the opening in said object upon rotation of said mandrel, means operable upon rotation of said mandrel for curling the peripheral edge of said opening to provide a smooth periphery therearound, means for expanding said mandrel into engagement with the periphery of the opening in said object and actuating means for sequentially actuating said expanding means, trimming means and curling means.

References Cited in the file of this patent UNITED STATES PATENTS 139,681 Marchand June 10, 1873 419,755 Duff Jan. 21, 1890 1,431,761 Schlaupitz Oct. 10, 1922 1,946,429 Smith et al. Feb. 6, 1934 2,022,797 Wyer Dec. 3, 1935 2,251,810 Smith Aug. 5, 1941 2,290,626 Bosornworth July 21, 1942 2,438,999 Hartley Apr. 6, 1948 2,475,465 White July 5, 1949 FOREIGN PATENTS 3,261 Great Britain of 1897 

